101221399 has 2 divisors, whose sum is σ = 101221400. Its totient is φ = 101221398.

The previous prime is 101221331. The next prime is 101221427. The reversal of 101221399 is 993122101.

It is an a-pointer prime, because the next prime (101221427) can be obtained adding 101221399 to its sum of digits (28).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 101221399 - 2¹¹ = 101219351 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101221319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50610699 + 50610700.

It is an arithmetic number, because the mean of its divisors is an integer number (50610700).

Almost surely, 2^101221399 is an apocalyptic number.

101221399 is a deficient number, since it is larger than the sum of its proper divisors (1).

101221399 is an equidigital number, since it uses as much as digits as its factorization.

101221399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 101221399 is about 10060.8846032543. The cubic root of 101221399 is about 466.0409853616.

The spelling of 101221399 in words is "one hundred one million, two hundred twenty-one thousand, three hundred ninety-nine".